gdb/i386-sol2-tdep.c

   1 /* Target-dependent code for Solaris x86.
   2
   3    Copyright (C) 2002-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "value.h"
  22 #include "osabi.h"
  23
  24 #include "sol2-tdep.h"
  25 #include "i386-tdep.h"
  26 #include "solib-svr4.h"
  27
  28 /* From <ia32/sys/reg.h>.  */
  29 static int i386_sol2_gregset_reg_offset[] =
  30 {
  31   11 * 4,                       /* %eax */
  32   10 * 4,                       /* %ecx */
  33   9 * 4,                        /* %edx */
  34   8 * 4,                        /* %ebx */
  35   17 * 4,                       /* %esp */
  36   6 * 4,                        /* %ebp */
  37   5 * 4,                        /* %esi */
  38   4 * 4,                        /* %edi */
  39   14 * 4,                       /* %eip */
  40   16 * 4,                       /* %eflags */
  41   15 * 4,                       /* %cs */
  42   18 * 4,                       /* %ss */
  43   3 * 4,                        /* %ds */
  44   2 * 4,                        /* %es */
  45   1 * 4,                        /* %fs */
  46   0 * 4                         /* %gs */
  47 };
  48
  49 /* Return whether THIS_FRAME corresponds to a Solaris sigtramp
  50    routine.  */
  51
  52 static int
  53 i386_sol2_sigtramp_p (struct frame_info *this_frame)
  54 {
  55   CORE_ADDR pc = get_frame_pc (this_frame);
  56   const char *name;
  57
  58   find_pc_partial_function (pc, &name, NULL, NULL);
  59   return (name && (strcmp ("sigacthandler", name) == 0
  60                    || strcmp (name, "ucbsigvechandler") == 0
  61                    || strcmp (name, "__sighndlr") == 0));
  62 }
  63
  64 /* Solaris doesn't have a `struct sigcontext', but it does have a
  65    `mcontext_t' that contains the saved set of machine registers.  */
  66
  67 static CORE_ADDR
  68 i386_sol2_mcontext_addr (struct frame_info *this_frame)
  69 {
  70   CORE_ADDR sp, ucontext_addr;
  71
  72   sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
  73   ucontext_addr = get_frame_memory_unsigned (this_frame, sp + 8, 4);
  74
  75   return ucontext_addr + 36;
  76 }
  77
  78 /* SunPRO encodes the static variables.  This is not related to C++
  79    mangling, it is done for C too.  */
  80
  81 static const char *
  82 i386_sol2_static_transform_name (const char *name)
  83 {
  84   if (name[0] == '.')
  85     {
  86       const char *p;
  87
  88       /* For file-local statics there will be a period, a bunch of
  89          junk (the contents of which match a string given in the
  90          N_OPT), a period and the name.  For function-local statics
  91          there will be a bunch of junk (which seems to change the
  92          second character from 'A' to 'B'), a period, the name of the
  93          function, and the name.  So just skip everything before the
  94          last period.  */
  95       p = strrchr (name, '.');
  96       if (p != NULL)
  97         name = p + 1;
  98     }
  99   return name;
 100 }
 101
 102 /* Solaris 2.  */
 103
 104 static void
 105 i386_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 106 {
 107   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 108
 109   /* Solaris is SVR4-based.  */
 110   i386_svr4_init_abi (info, gdbarch);
 111
 112   /* The SunPRO compiler puts out 0 instead of the address in N_SO symbols,
 113      and for SunPRO 3.0, N_FUN symbols too.  */
 114   set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);
 115
 116   /* Handle SunPRO encoding of static symbols.  */
 117   set_gdbarch_static_transform_name (gdbarch, i386_sol2_static_transform_name);
 118
 119   /* Solaris reserves space for its FPU emulator in `fpregset_t'.
 120      There is also some space reserved for the registers of a Weitek
 121      math coprocessor.  */
 122   tdep->gregset_reg_offset = i386_sol2_gregset_reg_offset;
 123   tdep->gregset_num_regs = ARRAY_SIZE (i386_sol2_gregset_reg_offset);
 124   tdep->sizeof_gregset = 19 * 4;
 125   tdep->sizeof_fpregset = 380;
 126
 127   /* Signal trampolines are slightly different from SVR4.  */
 128   tdep->sigtramp_p = i386_sol2_sigtramp_p;
 129   tdep->sigcontext_addr = i386_sol2_mcontext_addr;
 130   tdep->sc_reg_offset = tdep->gregset_reg_offset;
 131   tdep->sc_num_regs = tdep->gregset_num_regs;
 132
 133   /* Solaris has SVR4-style shared libraries.  */
 134   set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
 135   set_solib_svr4_fetch_link_map_offsets
 136     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 137
 138   /* How to print LWP PTIDs from core files.  */
 139   set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str);
 140 }
 141 \f
 142
 143 static enum gdb_osabi
 144 i386_sol2_osabi_sniffer (bfd *abfd)
 145 {
 146   /* If we have a section named .SUNW_version, then it is almost
 147      certainly Solaris 2.  */
 148   if (bfd_get_section_by_name (abfd, ".SUNW_version"))
 149     return GDB_OSABI_SOLARIS;
 150
 151   return GDB_OSABI_UNKNOWN;
 152 }
 153
 154 void _initialize_i386_sol2_tdep ();
 155 void
 156 _initialize_i386_sol2_tdep ()
 157 {
 158   /* Register an ELF OS ABI sniffer for Solaris 2 binaries.  */
 159   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
 160                                   i386_sol2_osabi_sniffer);
 161
 162   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_SOLARIS,
 163                           i386_sol2_init_abi);
 164 }